选用适当的介词＋whom/which完成句子

1．Peter, ________ I played tennis on Sundays, was stronger than I．

2．Is that the fish ________ you asked the waiter?

3．The moon is a ball ________ there are no living things．

4．Water is very important to fish, ________ it can't live．

5．We love the village ________ we have worked for two years．